campbell



Oct. 14, 1958 D. H. CAMPBELL 2,855,692

INJECTOR GAUGE TOOL FOR DIESEL ENGINES Filed Dec. 7, 1953 IN VEN TOR.DEWEY H. CA M PBELL United States Patent INJECTOR GAUGE TOOL FOR DIESELENGINES Dewey H. Campbell, Newport, 0reg., assignor to I. & G.lgranufacturing Co., Portland, Oreg., a corporation of egon ApplicationDecember 7, 1953, Serial No. 396,673

3 Claims. (Cl. 33-481) My invention relates to injector gaugeinstruments for diesel engines, particularly General Motors engines.

The primary object of my invention is to set the injector plunger of theinjector to its proper setting by placing my instrument over the top ofthe injector and adjusting the rocker arm until my gauge indicates theproper setting.

In the use of my new and improved instrument, the same is adapted to beset by a standard plug gauge, after which my new and improved instrumentis applied to the top of the injector. The rocker arm is then adjustedto set the injector plunger to correspond to my gauge setting.Heretofore this adjustment has been made by a gauge pin whose bottomrests in a hole located on the top of the injector body and having across bar on the top for engaging the top of the follower which operatesthe injector plunger.

When the operator contacts the said cross bar on the top of the followerhe knows that the plunger is inthe proper position. This has not been anaccurate method of adjusting the injector plunger, because of dirtbecom- 1 ing lodged in the said hole on top of the injector, and alsobecause of the likelihood of improper alignment of the gauge.

With my new and improved instrument, a tubular tool body having legs forengaging the top of the injector surrounds the follower and spring, theinstrument having a dial micrometer forming part thereof, the said dialmicrometer being adjusted by a standard plug gauge before applying thesame to the injector, thereby giving an accurate reading in theadjusting of the said rocker arm contacting the injector follower.

These and other incidental objects will be apparent in the drawings,specification and claims.

Referring to the drawings:

Figure 1 is a perspective view of my new and improved gauge instrumentfor injector plungers.

Figure 2 is a front view of the instrument, wherein a plug gauge isshown in place adjusting the stem of the instrument to the properreading.

Figure 3 illustrates the plug gauge, partially in section,

that is used to set my new and improved instrument.

Figure 4 illustrates how my new and improved instrument is applied downover the injector plunger, resting on the body of the injector, and overthe plunger rocker arm which is broken away.

Figure 5 is a plan view of Figure 4, taken on line 5-5, particularlyshowing how the supporting legs of a my instrument avoid the hold downclamp of the in- \jector.

Figure 6 is a front view, taken on line 6-6 of Figure .4, illustratinghow the supporting legs of my instrument avoid the injector hold downclamps and rocker arm.

My instrument includes a cylindrical tubular tool body 1, having anopening or slot 2 running throughout most of its length. The object ofthis slot is to straddle the rocker arm 3 of the engine. The rocker arm3 operates ;he injector plunger rod 4 through the usual follower 16 andthe stud ball seat assembly 4A, the seat having a flange 4B for restingon the follower, referring particularly to Figure 4. The tubular body 1is also cut away on both sides at 6 to form three legs 6A which avoidthe ringers 26 and 27 of the hold down clamp 25 of the injector.

Formed on the upper end of the tubular tool body 1 is a horizontal endwall 7 in which the stem 8 of the dial micrometer gauge 9 is clamped.The end wall is split as indicated at 10 so that the clamping screw 11will clamp the jaws 12 to the stem 8 of the dial micrometer gauge. Thebottom 13 of the stem 8 rests on the top shoulder 14 of the body 1.

The term instrument is used herein to designate the combination of dialmicrometer 9 and gauge tool body 1 in assembled relation as shown inFigure 1.

The-dial micrometer gauge 9 has the usual measuring plunger 15, theoperation of which will be described later. The injector plunger 4 hasthe usual follower 16 keyed thereto. This follower rests on the top ofthe spring 17, which maintains the upper end of the follower in contactwith the rocker arm 3.

Referring to Figure 3, I show a standard plug gauge 18, consisting of acylindrical tubular body member 19 with an enlarged head 20 forming aperipheral shoulder 21. The shoulder 21 corresponds to the upper surface22 of the injector body 5. The upper surface 23 of the plug gauge 18 isadapted to contact the lower end 24 of the measuring plunger 15 of thedial micrometer gauge 9 when adjusting the latter. There are variouslengths of plug gauges 18 for the different sizes of Diesel engines.

I will now describe the operation of my new and improved instrument foradjusting plunger rods for injectors. Referring to Figure 2, I set thedial micrometer by inserting the plug gauge 18 within the lower end ofthe body member 1 of my instrument wherein the lower ends of the legs 6Acome to rest on the shoulder 21 of the said plug gauge. The uppersurface 23 contacts the lower end 24 of the micrometer gauge plunger 15.The operator then adjusts the micrometer gauge dial 9A to a zero readingunder the pointer 9B by rotating the rim of the gauge. This gaugeadjustment is a standard feature of various well known types of dialmicrometer. This adjustment has just been made in Figure 2.

When the gauge instrument is removed from the plug gauge 18, the pointerwill take a position as indicated in Figure 1 away from the zero mark.My new and improved gauge instrument is then placed over the plungerassembly of the injector, the legs 6A coming to rest on the surface 22of the injector body 5. The legs 6A of my gauge instrument are cut awayor placed on the tool body 1 so as to avoid the rocker arm 3 and thefingers 26 and 27 of the hold down clamp 25, as best illustrated inFigures 4, 5 and 6, supporting tool body 1 perpendicular to surface 22.The lower end 24 of the plunger 15 of the dial micrometer 9 contacts theupper surface of the flange 4B of the seat 4A of the ball stud assemblyresting on the upper end of the follower 16.

In the later model engines, the ball stud assembly is eliminated, inwhich case the plunger 15 would rest directly on the upper end of .thefollower.

When the bottom end 24 of the plunger 15 of the dial micrometer. comesto rest on top of the flange 4B of the seat 4A or the top of thefollower as the case may be, the rocker arm is adjusted so as to raiseor lower the follower until the pointer 9B comes to rest on the zeromark of the dial micrometer. This indicates that the injector plunger 4has been adjusted to the proper position, as measured by the distancebetween the top of the follower 16 and the surface 22 on the top of theinjector body 5. This distance corresponds to the distance on the pluggauge between its top 23 and its shoulder 21.

It is a very simple matter to apply my gauge instrument as abovedescribed. to the upper end assembly of the injector an'ddue tothe .factthat it has three legs 6A coming down on'the surface 22 of .the't'op vofthe injector body, a three-point tripod support is obtained whichinsures accurate measurement between theupper end of the follower andthe upper surface 22 of the injector body.

I claim: i i 1. A dial micrometer diesel engine injector gauge tool forpositioning the measuring plunger of a dial micrometer on an injectorfollower and spring assembly of a diesel engine wherein said dialmicrometer hasa' measuring plunger projecting from one end of a tubularstem on the micrometer; said gauge tool comprising a tubular body withwall portions of the tube cut away at one end thereof to form a tripodsupport with three supporting legs adapted to straddle portions of theinjector structure and support said tubular body .on a surface of theinjector structure with portions of said tubular body closelysurrounding said injector follower and spring assembly, a clamp for saidmicrometer stem on the other end of said tubular body arranged to placesaid measuring plungerlongitudinally within said tubular body in aposition to engage said injector follower, and a shoulder on saidtubular body adjacent said clamp arranged to engage and position saidend of said micrometer stem.

2. A dial micrometer diesel engine injector gauge tool comprising acylindrical tubular body having wall portions of the tube cut away atone end thereof to form a tripod support having three legs arranged tosupport said body perpendicular to a flat supporting surface, an endwall on the other end of said body having a clamp to receive a dialmicrometer with a portion thereof extending longitudinally within saidbody, and a portion of the tube wall being cut away on one side of saidbody adjacent said end wall forming a positioning shoulder parallel withsaid end wall for said dial micrometer.

3. In combination with the tool defined in claim 2, a plug gauge havinga cylindrical body with a diameter to fit within said tubular body ofsaid tool and an end surface in a position to engage said extendingportion of a dial micrometer when a dial micrometer is mounted in saidclamp, and a head on said plug gauge body having a peripheral shoulderto engage and support the ends of said legs.

References Cited in the file of this patent UNITED STATES PATENTS

